I'm fairly new to the various tunings one can use for playing slide guitar. I'm also new to the concept of more than 6-strings! Bearing that in mind I just received a Fender Stringmaster D8 which has two necks and each has 8-strings. I currently have the one neck tuned to C6 (A-C-E-G-A-C-E-G) and plan on tuning the second to A6 which I can only guess at what the notes are. I think A6 tuning would be F#-A-C#-E-F#-A-C#-E. Can someone confirm?
I also have a standard 6-string guitar that I've tuned to E (E-B-E-G#-B-E) and have been having fun with that. What I am finding out with this guitar (an electric) is playing it lap style with a tone bar (a Shubb-Pearse in this case) is it seems the bar is too heavy and you have to be more careful of adding any extra pressure which usually results in a bad sound. I've played it as a normal guitar with a finger slide with more success. I am working on getting a straight bass going at the same time as some slide work. This takes a little more concentration to get the damping behind the finger slide right and still have a clear bass going. In time...
Meanwhile, I have a Weissenborn guitar on the way that is supposed to be delivered on Monday. This is a lap steel guitar (Hawaiian style) and I can't wait to hear the sounds it produces.
I'm not sure of the tuning a Weissenborn guitar is normally tuned to. I do know the Weissenborn I'm getting has Daddario Strings in these sizes: .014, .018, .026w, .034w, .044w, .056w. Looking around the 'net my best guess is this would accommodate a D tuning.